An interdigital composite ultrasonic partial discharge charged detector and method

Abstract

The application relates to the technical field of power detection, and particularly discloses a forked composite ultrasonic partial discharge live detection instrument and method, which comprises an instrument body, a wire and a detection head. The instrument body is provided with a display device and a control panel. The detection head comprises a fixed shell, a forked sensor and a clamping mechanism. The forked sensor is arranged in an arc-shaped groove of the fixed shell. The clamping mechanism comprises a hinged arm, a clamping plate and a bidirectional worm. The hinged arm is meshed with the bidirectional worm through a worm wheel. The clamping plate is connected with an extension plate and a driving wheel. The detection head is also provided with a suction surface and a suction disc controlled by an air pump. The mechanical transmission structure of the bidirectional worm driving the worm wheel is combined with the air pump-controlled pneumatic extension plate, so that the detection head can realize rapid self-adaptive clamping of different cable diameters. The worm and worm gear transmission has the self-locking characteristic, can keep constant clamping force through mechanical meshing after clamping, and prevents loosening caused by vibration during the detection process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power detection, in particular to a kind of interdigital composite ultrasonic wave partial discharge live detection instrument and method. BACKGROUND

[0002] The interdigital composite ultrasonic wave partial discharge live detection instrument is for the on-line monitoring and fault early warning of the partial discharge of transformer, GIS (gas insulated switchgear), high-voltage cable and other equipment, and the partial discharge (PD) is an important sign of the insulation deterioration of power equipment.

[0003] For example, the prior art patent CN221039304U discloses a partial discharge detector, which comprises a detector main body and a connecting line. The detector main body is provided with a placing groove, and the placing groove is equipped with an operation disc. The operation disc is equipped with a connecting disc, and the connecting disc is equipped with a fixing disc. The operation disc is provided with an operation cavity, and the connecting disc and the fixing disc are provided with an extension cavity. The fixing disc and the connecting disc are equipped with a movable rod, and the movable rod is equipped with a traction disc. The traction disc is equipped with a clamping rod, and the fixing disc is provided with a clamping groove. The clamping rod is connected with the clamping groove. The movable rod is equipped with a pressing block, a fixing plate and an extension spring. The above-mentioned partial discharge detector solves the problem that the existing partial discharge detector and detection line are placed separately, which is inconvenient to carry, and the detection line cannot be adjusted according to the length required by the power equipment through the cooperation of the placing groove and the connecting disc.

[0004] Although the detector of the prior art can detect cables and cabinets, it is usually necessary to fix the probe head on the cable or cabinet during detection. Auxiliary tools (usually manual operation) are needed during fixing, and after the probe head is adapted to the cable, the adapted shape of the probe head needs to be reset when switching to the cabinet detection environment. SUMMARY

[0005] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] The present application provides an interdigital composite ultrasonic wave partial discharge live detection instrument and method, which can solve the problem that after the probe head is adapted to the cable, the adapted shape of the probe head needs to be reset when switching to the cabinet detection environment. The specific scheme is as follows:

[0007] The application provides a kind of interdigital composite ultrasonic partial discharge charged detector in one aspect, including detector body, wire and detection head, the detector body is equipped with display device and control panel, the detection head includes fixed shell, interdigital sensor and clamping mechanism, the interdigital sensor is equipped in the circular recess of fixed shell, the clamping mechanism includes articulated arm, clamping plate and bidirectional worm, the articulated arm is engaged with bidirectional worm by worm gear, the clamping plate is connected with extension plate and drive wheel, the detection head is also equipped with adsorption surface and suction cup controlled by air pump;

[0008] Wherein, articulated arm and clamping plate can switch between clamping mode and unfolded mode, when articulated arm and clamping plate are in clamping mode, they can adapt to cable surface, when articulated arm and clamping plate are in unfolded mode, they can adapt to flat surface.

[0009] In the above scheme, non-contact interdigital sensor is combined with ball sliding design to realize high sensitivity detection while avoiding physical contact wear. The interdigital sensor can perceive weak signals of partial discharge without contacting the cable through alternating electric field coupling principle, effectively eliminating the signal interference or device damage risk caused by friction of traditional contact sensor. The ball is embedded in the containing groove of the circular recess sidewall, and the friction resistance is reduced when the detection head moves by free rolling, ensuring that the sensor maintains a constant distance from the cable surface, avoiding detection errors caused by vibration or deviation. In addition, the linkage design of ball structure, drive wheel and transmission belt enables the detection head to automatically roll along the cable for detection without manual dragging, greatly reducing the operation complexity and improving the detection efficiency.

[0010] Preferably, the circular recess sidewall of the fixed shell is provided with a ball, which is embedded in the containing groove and can freely roll.

[0011] In the above scheme, the mechanical transmission structure of bidirectional worm drive worm gear is combined with the air-driven extension plate controlled by the air pump, and the detection head realizes rapid self-adaptive clamping of different cable diameters. The worm gear and worm drive have self-locking characteristics, which can maintain constant clamping force after clamping to prevent loosening caused by vibration during detection. The air pump drives the extension plate to extend by positive pressure, which expands the wrapping area of the clamping plate on the cable, and cooperates with the steel wire limiting design to ensure that the extension plate only slides in the predetermined direction, avoiding deviation or falling off. At the same time, the air pump negative pressure cooperates with the suction cup to realize stable adsorption of the detection head on the plane surface of the cabinet, adapting to the detection requirements of multiple scenes.

[0012] Preferably, the clamping plate and articulated arm are connected through sliding groove and sliding block, and a first telescopic rod is arranged between them.

[0013] Preferably, the outer wall of the clamping plate is provided with an air inlet tank, the extension plate is communicated with the air inlet tank through an arc-shaped rod, and the air pump drives the extension plate to extend and retract by positive pressure.

[0014] Preferably, the driving wheel is connected with the transmission belt through the transmission wheel and is controlled to rotate by the driving device.

[0015] In the above scheme, the probe head integrates the driving wheel and the negative pressure adsorption surface double-mode moving scheme, breaking through the limitation of traditional detection equipment which is only applicable to a single scene of cable or flat surface. The driving wheel is driven by a micro motor and cooperates with the transmission belt to realize synchronous rotation of multiple wheels, so that the probe head can move autonomously along the curved or inclined cable. The adsorption surface generates negative pressure through the air pump, and in combination with the elastic support of the telescopic pipe and the spring, stable adsorption can be formed on the surface of the cabinet. Even if there are concave-convex or oil stains on the surface, the adsorption can also be reliably fixed. In addition, the electromagnetic valve controls the cavities separated by the partition plate, so as to realize independent regulation and control of the air path of the suction cup and the negative pressure hole, and avoid cross interference.

[0016] Preferably, the adsorption surface is provided with a negative pressure hole, and the suction cup is connected with the air pump through the telescopic pipe and the spring.

[0017] Preferably, the air inlet box is provided with a partition plate and an electromagnetic valve for switching the air flow path to control the extension plate and the suction cup.

[0018] Preferably, a anti-dropping steel wire is arranged between the extension plate of the probe head and the arc-shaped groove, and the telescopic pipe of the suction cup can be replaced by an electric telescopic rod.

[0019] Preferably, the interdigital sensor is a non-contact sensor based on electric field coupling, and the interdigital electrodes form an alternating electric field to detect the disturbance of the target object.

[0020] In another aspect, the present application provides a kind of interdigital composite ultrasonic partial discharge charged detection method, comprising the following steps:

[0021] S1, the probe head is installed to the surface of the measured object, and the clamping mode or the unfolded mode is selected according to the shape of the surface of the measured object:

[0022] S2, when the measured object is a cable, the bidirectional worm of the probe head is rotated, the hinged arm is driven to close by the worm gear, so that the clamping plate is clamped and adapted to the surface of the cable;

[0023] S3, when the measured object is a flat surface, the bidirectional worm is reversely rotated to unfold the hinged arm, the clamping plate is laid flat by adjusting the extension plate through the driving wheel, and the adsorption surface or the suction cup is adsorbed and fixed by starting the air pump;

[0024] S4, the ultrasonic signal is collected by the interdigital sensor, and the partial discharge detection result is output on the display device after being processed by the detector body.

[0025] Compared with the prior art, the present application can at least realize one of the following beneficial effects:

[0026] 1、The application adopts non-contact interdigital sensor combined with ball sliding design, which realizes high sensitivity detection while avoiding physical contact wear, the interdigital sensor can perceive weak signals of partial discharge through the principle of alternating electric field coupling without contact cable, effectively eliminating the signal interference or device damage risk caused by friction of traditional contact sensor, the ball is embedded in the containing groove of the arc-shaped groove side wall, and the friction resistance during the movement of the probe head is reduced through free rolling, so that the sensor and the cable surface can maintain a constant distance, avoiding detection errors caused by vibration or deviation, in addition, the linkage design of the ball structure, driving wheel and transmission belt enables the probe head to automatically roll and detect along the cable without manual dragging, greatly reducing the operation complexity and improving the detection efficiency.

[0027] 2、The application realizes the rapid self-adaptive clamping of the probe head to different cable diameters through the mechanical transmission structure of bidirectional worm driving worm gear and the pneumatic extension plate controlled by the air pump.

[0028] 3、The probe head integrates the driving wheel and the negative pressure adsorption surface double-mode movement scheme, breaking through the single scene limitation of traditional detection equipment only applicable to cable or plane, the driving wheel is driven by a micro motor, and the transmission belt is used to realize synchronous rotation of multiple wheels, so that the probe head can move autonomously along the curved or inclined cable, the negative pressure adsorption surface is generated by the air pump, and the elastic support of the telescopic pipe and the spring can form stable adsorption on the surface of the cabinet, even if there are concave-convex or oil stains on the surface, it can also be reliably fixed, in addition, the electromagnetic valve controls the cavity separated by the partition plate, realizes independent regulation and control of the air path of the suction cup and the negative pressure hole, and avoids cross interference.

[0029] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. Among them:

[0031] Figure 1 is a perspective view of the whole application;

[0032] Figure 2 is a perspective view of the application in open state;

[0033] Figure 3 is a perspective view of the probe head of the application;

[0034] Figure 4 is a perspective view of the fixed shell of the application;

[0035] Figure 5 is a perspective view of the whole fixed shell of the application;

[0036] Figure 6 is a perspective view of the probe head in use of the application;

[0037] Figure 7 is a perspective view of the application Figure 6 is an enlarged view of A in the above figure;

[0038] Figure 8 is a side view of the application;

[0039] Figure 9 is a perspective view of the driving wheel of the application;

[0040] Figure 10 is a structural view of the cabinet detection environment of the application.

[0041] In the figures, the reference signs are as follows:

[0042] 1, detection instrument body; 101, display device; 102, control panel; 3, plug; 2, wire; 6, probe head; 4, cable; 5, wire core; 601, fixed shell; 602, interdigital sensor; 603, hinged ear; 604, ball; 605, clamping plate; 606, hinged arm; 607, worm gear; 608, bidirectional worm; 609, sliding groove; 610, sliding block; 611, first telescopic rod; 612, extension plate; 613, arc-shaped rod; 614, air inlet box; 615, through hole; 616, partition plate; 617, electromagnetic valve; 618, spring; 619, telescopic tube; 620, suction cup; 621, driving wheel; 622, transmission wheel; 623, transmission belt; 624, driving device; 625, adsorption surface; 626, air inlet pipe; 627, air pump; 628, steel wire; 7, cabinet. DETAILED DESCRIPTION

[0043] The preferred embodiments of the application will be described in detail below with reference to the drawings, wherein the drawings form a part of the application and are used to explain the principles of the application together with the embodiments of the application.

[0044] Embodiment one: as Figure 1 , Figure 2As shown, the present application provides a kind of interdigital composite ultrasonic partial discharge charged detector, including detector body 1, detector body 1 provides display device 101 and control panel 102, wherein, display device 101 and control panel 102 and the electrical connection between detector body 1, so as to realize the effect of overall control, can respectively monitor the data of detection and adjust the parameter of detection, the rear end of detector body 1 is provided with plug 3, plug 3 is connected with the mainboard of detector body 1, plug 3 is inserted into wire 2, the other end of wire 2 is connected with probe head 6, probe head 6 can be attached on cable 4 or other object to be detected, wherein, the inside of cable 4 is provided with wire core 5, the cooperation of probe head 6 and detector body 1 can detect the discharge condition of wire core 5;

[0045] As shown in the figure, Figure 3 Probe head 6 can be wrapped on cable 4, and can move along cable 4 with the movement of detector body 1, so as to realize the detection of each position of cable 4 without the need for staff to pull probe head 6.

[0046] As shown in the figure, Figure 4 Probe head 6 includes fixed shell 601, which is provided with a circular-arc-shaped groove matching the outer wall of cable 4 near one end of the outer wall of cable 4, and interdigital sensor 602 is installed in the circular-arc-shaped groove, it should be noted that the interdigital sensor 602 is non-contact, which can detect the measured object without contacting the measured object, wherein one end of wire 2 is fixedly connected with one end of fixed shell 601, and wire 2 is electrically connected with interdigital sensor 602, and the electric signal detected by interdigital sensor 602 can be sent to the central processing unit built in detector body 1.

[0047] It should be noted that the working principle of non-contact interdigital sensor 602 is based on signal coupling of electric field or electromagnetic field, which realizes signal sensing by detecting the disturbance of target object to the field distribution around the sensor, and forms an alternating electric field in the surrounding space through interdigital electrode structure. When the measured object (such as charged equipment, biomolecules, etc.) enters the electric field, it will change the distribution of electric field or cause the change of capacitance / impedance, thereby generating a detectable electric signal (such as current or voltage fluctuation). This signal is directly related to the physical or chemical properties of the measured target (such as dielectric constant, charge distribution, concentration, etc.), and non-contact sensor needs to combine high-frequency signal modulation technology and noise suppression algorithm to distinguish target signal from environmental interference. For example, by optimizing the impedance matching of interdigital electrode, the attenuation of signal in air or other medium is reduced;

[0048] In order to avoid the abrasion of the fixed shell 601 and the interdigital sensor 602 when the probe head 6 moves on the cable 4, affecting the detection accuracy, the fixed shell 601 is provided with a plurality of rolling balls 604 on the side close to the cable 4, that is, on the side wall of the arc-shaped groove, and a plurality of accommodating grooves matched with the rolling balls 604 are formed on the side wall of the arc-shaped groove, so that the rolling balls 604 can freely move in the accommodating grooves, and the shape of the accommodating grooves is configured to prevent the rolling balls 604 from falling out of the accommodating grooves.

[0049] As shown in Figure 5 , two clamping plates 605 symmetrically arranged on the fixed shell 601 are further provided with recesses on the adjacent sides, so that the two clamping plates 605 can wrap the cable 4 during use, and hinged arms 606 are further provided at the upper and lower ends of the fixed shell 601, one end of the hinged arm 606 is hinged to the upper and lower ends of the fixed shell 601, and the hinged arm 606 is specifically configured as follows: a hinged lug 603 is arranged at the upper and lower ends of the fixed shell 601, a hinged hole is formed in the middle of the hinged lug 603, and a hinged column is connected to one end of the hinged arm 606, the hinged column is hinged to the hinged hole; wherein the middle of the clamping plate 605 is slidingly connected to one end of the hinged arm 606, one end of the hinged arm 606 is provided with a sliding groove 609, and the middle of the clamping plate 605 is fixedly connected with a sliding block 610, wherein the sliding block 610 is slidingly connected with the inside of the sliding groove 609, and a first telescopic rod 611 is connected between the outer wall of the sliding block 610 and the inner wall of the sliding groove 609, the first telescopic rod 611 can drive the sliding block 610 to slide in the sliding groove 609.

[0050] As shown in Figure 6 , a bidirectional worm 608 is installed in the fixed shell 601, a rotating hole (not shown in the figure) matched with the bidirectional worm 608 is formed in the fixed shell 601, and the bidirectional worm 608 rotates in the rotating hole. In order to realize the rotation of the hinged arm 606, a worm wheel 607 is arranged at one end of the hinged arm 606, the worm wheel 607 is arranged in the middle interlayer of the hinged arm 606, and the middle axis of the worm wheel 607 is concentric with the rotation axis of the hinged movement of the hinged arm 606, wherein the two ends of the bidirectional worm 608 respectively extend to one end of the two hinged arms 606, so as to engage with the two worm wheels 607, a driving source is installed at one end of the bidirectional worm 608, the bidirectional worm 608 is driven to rotate by the driving source, so as to drive the worm wheel 607 to rotate, thereby realizing the rotation of the hinged arm 606. When the hinged arm 606 rotates, it can drive the clamping plate 605 to rotate, so that the two clamping plates 605 can clamp or release the cable 4.

[0051] As shown in Figure 7 , Figure 8As shown, in order to prevent the probe head 6 and the cable 4 from being separated, an extension plate 612 is further arranged at one end of the clamping plate 605, an arc-shaped groove is formed at one end of the clamping plate 605, one end of the extension plate 612 is slidingly installed in the arc-shaped groove, when the extension plate 612 is extended, the wrapping area of the cable 4 can be increased, one end of the extension plate 612 located inside the arc-shaped groove is connected with an arc-shaped rod 613, a through hole 615 is formed in the arc-shaped groove, the outer wall of the clamping plate 605 is connected with an air inlet tank 614, one end of the air inlet tank 614 is communicated with the through hole 615, the top of the air inlet tank 614 is connected with an air inlet pipe 626, the air inlet pipe 626 is connected with an air pump 627, the air pump 627 is fixedly installed on the outer wall of the fixed shell 601, so that good heat dissipation is ensured, the air pump 627 can generate negative pressure and positive pressure, when the air pump 627 generates positive pressure, air enters the arc-shaped groove from the air inlet tank 614 and the through hole 615, so as to push the extension plate 612 to extend outward, and a steel wire 628 is connected between the extension plate 612 and the inner wall of the arc-shaped groove, the steel wire 628 has no elasticity, the extension plate 612 can be pulled by the steel wire 628, so as to prevent the extension plate 612 from being separated from the arc-shaped groove;

[0052] It should be noted that the principle of the air pump generating positive pressure and negative pressure is mainly based on the gas compression and volume change mechanism, and the gas pressure state is changed through the movement of the mechanical structure;

[0053] The positive pressure refers to the state that the gas pressure is higher than the external atmospheric pressure, and the air pump realizes this process by compressing the gas volume; the mechanical compression mechanism: the piston, screw or diaphragm of the air pump reciprocates under the action of the driving mechanism (such as motor or pneumatic motor), and compresses the gas in the pump cavity. For example: piston air pump: the piston inhales when moving backward, and compresses the gas when moving forward, so that the pressure in the pump cavity is increased, and finally the high-pressure gas is output through the exhaust valve; screw air pump: the gas is extruded by the rotation of the screw, the gas volume is gradually reduced, and continuous high-pressure output is formed; pneumatic booster pump: the piston is driven by compressed air, and the low-pressure gas is gradually pressurized to the set value;

[0054] The negative pressure (vacuum) refers to the state that the gas pressure is lower than the external atmospheric pressure, and the air pump realizes the suction by expanding the pump cavity volume to form a vacuum; for example, diaphragm vacuum pump: the diaphragm reciprocates under the action of the motor, when the diaphragm moves backward, the pump cavity volume is increased, the internal pressure is reduced, and the external gas is sucked into through the inlet valve under the atmospheric pressure difference; when the diaphragm moves forward, the inlet valve is closed and the gas is compressed, and finally it is discharged through the exhaust valve; and piston vacuum pump: the piston moves backward to expand the pump cavity volume, forms negative pressure to suck in the gas, and then the piston compresses the gas and discharges it.

[0055] The inside of the air inlet box 614 is divided into two cavities by the partition plate 616, the upper cavity is communicated with the through hole 615, the middle of the partition plate 616 is also separated by the electromagnetic valve 617, the lower cavity is provided with an extension pipe 619 at the lower side, the bottom of the extension pipe 619 is connected with a suction cup 620, the top end of the extension pipe 619 is connected with the partition plate 616 through a spring 618, and the spring 618 is in an elongated state by default;

[0056] As shown in Figure 9 , a plurality of drive wheels 621 are connected on the extension plate 612, one end of each of the plurality of drive wheels 621 is connected with a transmission wheel 622, the plurality of transmission wheels 622 are coupled and connected through a transmission belt 623, it should be noted that the transmission wheel 622 can be a chain wheel or a belt wheel, and the transmission belt 623 can be a chain or a belt, one end of one of the drive wheels 621 is connected with a driving device 624, the driving device 624 can be a micro motor, the driving device 624 drives the drive wheel 621 to rotate, and then the plurality of drive wheels 621 are driven to rotate through the transmission wheel 622 and the transmission belt 623, so that the drive wheel 621 can roll on the surface of the cable 4, and then cooperate with the action of the ball 604, so that the entire detection head 6 can form a rolling connection on the surface of the cable 4.

[0057] As a possible embodiment, as shown in Figure 10 , in order to enable the detection head 6 to be used on a flat surface such as a cabinet 7, an adsorption surface 625 is provided at one end of the fixed shell 601, a plurality of negative pressure holes are formed in the adsorption surface 625, and the negative pressure holes can extend to the air pump 627 through the cavity and pipeline in the fixed shell 601;

[0058] When the detection head 6 is applied to a flat surface, the bidirectional worm 608 is rotated, the bidirectional worm 608 drives the two worm gears 607 to rotate, the worm gears 607 drive the articulated arm 606 and the clamping plate 605 to rotate, so that the clamping plate 605 is in a vertical state, and the suction cup 620 automatically extends under the high elastic force of the spring 618, so that the suction cup 620 is attached to the cabinet 7, at this time, the air pump 627 generates negative pressure, so that the negative pressure holes and the suction cup 620 generate negative pressure, so that the detection head 6 can be adsorbed on the surface of the cabinet 7;

[0059] It should be noted that the spring 618 can also be replaced by an electric telescopic rod, so that the electric telescopic rod drives the suction cup 620 to extend and retract.

[0060] Embodiment two: The technical solution of the embodiment two is different from that of the embodiment one, and the embodiment two provides a kind of interdigital composite ultrasonic partial discharge live detection method, comprising the following steps:

[0061] S1: Position the cable, align the arc-shaped groove of the probe head 6 with the surface of the cable 4, and ensure that the interdigital sensor 602 is directly opposite the position of the core 5;

[0062] S2: Start the air pump positive pressure mode, start the air pump 627 through the control panel 102, select "positive pressure mode", and the gas enters the air inlet tank 614 through the air inlet pipe 626. The positive pressure pushes the extension plate 612 out of the arc-shaped groove of the clamping plate 605, and wraps the cable 4;

[0063] S3: Clamping cable, operating the control panel 102 to start the drive source such as a motor, driving the bidirectional worm 608 to rotate; the bidirectional worm 608 drives the two side worm gears 607 to rotate synchronously, making the articulated arm 606 rotate towards the cable; the clamping plate 605 slides along the sliding groove 609 through the sliding block 610, and the first extension rod 611 assists in adjusting the clamping force; when the clamping plate 605 is fully clamped, the drive source is stopped, and the probe head 6 is fixed on the surface of the cable 4;

[0064] S4: Start the drive wheel, start the drive device 624 such as a micro motor through the control panel 102, and the drive wheel 621 rolls along the surface of the cable 4. The transmission wheel 622 is linked with the transmission belt 623 to ensure that all drive wheels 621 rotate synchronously, driving the probe head 6 to move along the cable.

[0065] S5: Real-time monitoring of data, the interdigital sensor 602 detects the partial discharge signal of the core 5 through non-contact electric field coupling, and the electric signal is transmitted to the detector body 100 through the wire 2. The display device 101 displays the electric field disturbance waveform and discharge intensity in real time, and the operator adjusts the detection parameters such as sensitivity and filter frequency through the control panel 102.

[0066] Flat surface detection:

[0067] S1: Switch to adsorption mode, switch the air pump 627 to "negative pressure mode" through the control panel 102, and close the electromagnetic valve 617 to isolate the upper and lower cavities of the air inlet tank 614;

[0068] S2: Adjust the position of the clamping plate, reverse drive the bidirectional worm 608 to make the clamping plate 605 rotate to the vertical state and be perpendicular to the fixed shell 601, and release the clamping of the cable;

[0069] S3: Adsorb the surface of the cabinet, the adsorption surface 625 of the probe head 6 is attached to the surface of the cabinet 7, the suction cup 620 is automatically extended and attached under the elastic force of the spring 618, the air pump 627 generates negative pressure, and the negative pressure holes of the adsorption surface 625 and the suction cup 620 are adsorbed at the same time to fix the probe head 6.

[0070] In summary, the application adopts a non-contact interdigital sensor 602 combined with a ball 604 sliding design to achieve high sensitivity detection while avoiding physical contact wear. The interdigital sensor uses the principle of alternating electric field coupling to perceive weak signals of partial discharge without contact cable 4, effectively eliminating the signal interference or device damage risk caused by friction of traditional contact sensors. The ball 604 is embedded in the containing groove of the circular-arc-shaped groove side wall, reducing the friction resistance when the probe head 6 moves by free rolling, ensuring that the sensor maintains a constant distance from the surface of the cable 4, avoiding detection errors caused by vibration or deviation. In addition, the ball structure cooperates with the linkage design of the driving wheel 621 and the transmission belt 623, so that the probe head 6 can automatically roll and detect along the cable without manual dragging, greatly reducing the operation complexity and improving the detection efficiency. Through the mechanical transmission structure of the bidirectional worm 608 driving the worm gear 607, combined with the pneumatic extension plate 612 controlled by the air pump 627, the application realizes the rapid self-adaptive clamping of the probe head 6 to different cable diameters. The worm gear transmission has self-locking characteristics and can maintain a constant clamping force after clamping to prevent loosening during detection due to vibration. The air pump 627 drives the extension plate 612 to extend by positive pressure, which expands the wrapping area of the clamping plate 605 to the cable 4, and cooperates with the steel wire 628 limiting design to ensure that the extension plate 612 only slides in the predetermined direction, avoiding deviation or falling off. At the same time, the air pump negative pressure cooperates with the suction cup 620 to realize the stable adsorption of the probe head 6 on the surface of the cabinet 7, which adapts to the detection requirements in multiple scenes. The probe head 6 integrates the driving wheel 621 and the negative pressure adsorption surface 625 double-mode movement scheme, breaking through the single scene limitation of traditional detection equipment only applicable to cables or flat surfaces. The driving wheel 621 is driven by the micro motor 624, which cooperates with the transmission belt 623 to realize multi-wheel synchronous rotation, so that the probe head 6 can move autonomously along the curved or inclined cable. The adsorption surface 625 generates negative pressure through the air pump 627, combined with the elastic support of the telescopic tube 619 and the spring 618, which can form stable adsorption on the surface of the cabinet 7. Even if there are bumps or oil stains on the surface, it can also be reliably fixed. In addition, the electromagnetic valve 617 controls the cavities separated by the partition plate 616 to realize independent regulation and control of the air path of the suction cup 620 and the negative pressure hole, avoiding cross interference. The application significantly reduces equipment maintenance complexity and use cost through modular structure design.

[0071] In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of these terms herein is to be construed to cover the embodiments of the application whether or not the embodiments are described using the same term. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, if any, are used synonymously to encompass a non-exclusive inclusion, such that encompassed steps or elements can be interchanged with, or be in addition to, the listed ones without departing from the scope of the application. The terms "program" or software are used herein in a generic sense to refer to any type of computer code or set of computer-executable instructions that can be employed to program a computer or other processor configuration to implement various aspects associated with the present application.

[0073] The use of the terms "first", "second", "third", "fourth" and the like in the description of the application, if any, cannot be construed to specify a particular sequential or chronological order, unless expressly specified otherwise. Rather, these terms can be used solely as labels to distinguish between two or more distinct elements or steps in the process or method.

[0074] The preferred embodiments of the application disclosed above are only for helping to explain the application. The preferred embodiments are not exhaustive of all the details and limit the application to only the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application. The application is only limited by the scope of the appended claims and the full scope of equivalents thereof.

Claims

1. An interdigital composite ultrasonic partial discharge live detection instrument, comprising an instrument body (1), a wire (2) and a probe head (6), characterized in that: The detector body (1) is provided with a display device (101) and a control panel (102), the probe head (6) comprises a fixed shell (601), an interdigital sensor (602) and a clamping mechanism, the interdigital sensor (602) is arranged in the arc-shaped groove of the fixed shell (601), the clamping mechanism comprises a hinged arm (606), a clamping plate (605) and a bidirectional worm (608), the hinged arm (606) is engaged with the bidirectional worm (608) through a worm wheel (607), the clamping plate (605) is connected with an extension plate (612) and a driving wheel (621), the probe head (6) is further provided with an adsorption surface (625) controlled by an air pump (627) and a suction cup (620). The outer wall of the clamping plate (605) is provided with an air inlet box (614), the extension plate (612) is communicated with the air inlet box (614) through an arc-shaped rod (613), and the air pump (627) drives the extension plate (612) to stretch out and retract through positive pressure. The hinged arm (606) and the clamping plate (605) can switch between a clamping mode and an unfolded mode, the hinged arm (606) and the clamping plate (605) can be adapted to the surface of the cable (4) when being in the clamping mode, and the hinged arm (606) and the clamping plate (605) can be adapted to a flat surface when being in the unfolded mode. A through hole (615) is arranged in the arc-shaped groove; The inside of the air inlet box (614) is divided into two cavities by a partition plate (616), the upper cavity is communicated with the through hole (615), the middle of the partition plate (616) is further separated by an electromagnetic valve (617), and the lower cavity is provided with an extension tube (619) below. The driving wheel (621) is installed on the extension plate (612), one end of each of the driving wheels (621) is connected with a transmission wheel (622), the transmission wheels (622) are coupled and connected through a transmission belt (623), the transmission wheel (622) is a chain wheel or a belt wheel, the transmission belt (623) is a chain or a belt, one end of one of the driving wheels (621) is connected with a driving device (624), the driving wheel (621) is driven to rotate through the driving device (624), then the driving wheels (621) are driven to rotate through the transmission wheel (622) and the transmission belt (623), so that the driving wheel (621) can roll along the surface of the cable (4), and then the whole probe head (6) can form a rolling connection along the surface of the cable (4) through the action of the ball (604).

2. The interdigital compound ultrasonic partial discharge live detection instrument of claim 1, wherein: The sidewall of the arc-shaped groove of the fixed shell (601) is provided with a ball (604), the ball (604) is embedded in the containing groove and can freely roll.

3. The interdigital compound ultrasonic partial discharge live detection instrument of claim 1, wherein: The clamping plate (605) and the hinged arm (606) are connected through a sliding groove (609) and a sliding block (610), and a first extension rod (611) is arranged between the clamping plate (605) and the hinged arm (606).

4. The interdigital compound ultrasonic partial discharge live detection instrument of claim 1, wherein: The adsorption surface (625) is provided with a negative pressure hole, and the suction cup (620) is connected with the air pump (627) through the telescopic pipe (619) and the spring (618).

5. The interdigital compound ultrasonic partial discharge live detection instrument of claim 2, wherein: The air inlet box (614) is provided with a baffle (616) and an electromagnetic valve (617) for switching the air flow path to control the extension plate (612) and the suction cup (620).

6. The interdigital compound ultrasonic partial discharge live detection instrument of claim 1, wherein: The extension plate (612) of the probe head (6) is provided with an anti-dropping steel wire (628) between the extension plate (612) and the arc-shaped groove, and the telescopic pipe (619) of the suction cup (620) can be replaced by an electric telescopic rod.

7. The interdigital compound ultrasonic partial discharge live detection instrument of claim 1, wherein: The interdigital sensor (602) is a non-contact sensor based on electric field coupling, and the interdigital electrodes form an alternating electric field to detect the disturbance of the target object.

8. A method for detecting partial discharge charging by using the interdigital compound ultrasonic partial discharge charging detector according to any one of claims 1-7. The method comprises the following steps: S1, the probe head (6) is installed to the surface of the measured object, and the clamping mode or the unfolded mode is selected according to the shape of the surface of the measured object: S2, when the measured object is a cable (4), the bidirectional worm (608) of the probe head (6) is rotated to drive the worm gear (607) to drive the articulated arm (606) to close, so that the clamping plate (605) is adapted to clamp the surface of the cable (4); S3, when the measured object is a flat surface, the articulated arm (606) is unfolded by reversing the bidirectional worm (608), the extension plate (612) is adjusted through the driving wheel (621) to make the clamping plate (605) flat, and the air pump (627) is started to make the adsorption surface (625) or the suction cup (620) adsorb and fix; S4, the ultrasonic signal is collected by the interdigital sensor (602), and after being processed by the detector body (1), the partial discharge detection result is output on the display device (101).

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